package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Follow;
import com.hmdp.mapper.FollowMapper;
import com.hmdp.service.IFollowService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.UserHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Autowired
    private UserServiceImpl userService;

    @Override
    public Result follow(Long followUserId, Boolean isFollow) {
        Long id = UserHolder.getUser().getId();
        if (isFollow) {
            Follow follow = new Follow();
            follow.setUserId(id);
            follow.setFollowUserId(followUserId);
            boolean save = save(follow);
            if (save) {
                stringRedisTemplate.opsForSet()
                        .add("follows:" + id.toString(), followUserId.toString());
            }
        } else {
            boolean remove = remove(new QueryWrapper<Follow>()
                    .eq("user_id", id)
                    .eq("follow_user_id", followUserId));
            if (remove) {
                stringRedisTemplate.opsForSet()
                        .remove("follows:" + id.toString(), followUserId.toString());
            }
        }
        return Result.ok();
    }

    @Override
    public Result isFollow(Long followUserId) {
        Long id = UserHolder.getUser().getId();
        Integer count = query().eq("follow_user_id", followUserId).eq("user_id", id).count();
        return Result.ok(count > 0);
    }

    @Override
    public Result commonFollow(Long id) {
        UserDTO user = UserHolder.getUser();
        if (user == null) {
            return Result.fail("请先登录");
        }
        String key = "follows:" + user.getId();
        String key2 = "follows:" + id;
        Set<String> intersect = stringRedisTemplate.opsForSet().intersect(key, key2);
        if(intersect==null||intersect.isEmpty()){
            return Result.ok("无共同关注！");
        }
        List<Long> ids = intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        List<UserDTO> collect = userService.listByIds(ids).stream()
                .map(user1 -> BeanUtil.copyProperties(user1, UserDTO.class))
                .collect(Collectors.toList());
        return Result.ok(collect);
    }
}
